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Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution

Rongsheng Cai Orcid Logo, Peter R. Ellis, Jinlong Yin, Jian Liu, Christopher M. Brown, Ross Griffin, Guojing Chang, Dongjiang Yang, Jun Ren, Kevin Cooke, Peter T. Bishop, Wolfgang Theis, Richard Palmer Orcid Logo

Small, Volume: 14, Issue: 13, Start page: 1703734

Swansea University Authors: Rongsheng Cai Orcid Logo, Richard Palmer Orcid Logo

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DOI (Published version): 10.1002/smll.201703734

Abstract

The deposition of preformed nanocluster beams onto suitable supports represents a new paradigm for the precise preparation of heterogeneous catalysts. The performance of the new materials must be validated in model catalytic reactions. It is shown that gold/copper (Au/Cu) nanoalloy clusters (nanopar...

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Published in: Small
ISSN: 16136810
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa38237
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spelling 2020-08-14T12:45:12.9743177 v2 38237 2018-01-22 Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution c2d38332a07bde5ce1ce66d8750f652e 0000-0002-2148-0563 Rongsheng Cai Rongsheng Cai true false 6ae369618efc7424d9774377536ea519 0000-0001-8728-8083 Richard Palmer Richard Palmer true false 2018-01-22 EEN The deposition of preformed nanocluster beams onto suitable supports represents a new paradigm for the precise preparation of heterogeneous catalysts. The performance of the new materials must be validated in model catalytic reactions. It is shown that gold/copper (Au/Cu) nanoalloy clusters (nanoparticles) of variable composition, created by sputtering and gas phase condensation before deposition onto magnesium oxide powders, are highly active for the catalytic reduction of 4-nitrophenol in solution at room temperature. Au/Cu bimetallic clusters offer decreased catalyst cost compared with pure Au and the prospect of beneficial synergistic effects. Energy-dispersive X-ray spectroscopy coupled with aberration-corrected scanning transmission electron microscopy imaging confirms that the Au/Cu bimetallic clusters have an alloy structure with Au and Cu atoms randomly located. Reaction rate analysis shows that catalysts with approximately equal amounts of Au and Cu are much more active than Au-rich or Cu-rich clusters. Thus, the interplay between the Au and Cu atoms at the cluster surface appears to enhance the catalytic activity substantially, consistent with model density functional theory calculations of molecular binding energies. Moreover, the physically deposited clusters with Au/Cu ratio close to 1 show a 25-fold higher activity than an Au/Cu reference sample made by chemical impregnation. Journal Article Small 14 13 1703734 16136810 Au/Cu nanoparticles; catalysis; cluster beam deposition; nanoalloys; nitrophenol reduction 27 3 2018 2018-03-27 10.1002/smll.201703734 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-08-14T12:45:12.9743177 2018-01-22T11:05:57.9310993 Rongsheng Cai 0000-0002-2148-0563 1 Peter R. Ellis 2 Jinlong Yin 3 Jian Liu 4 Christopher M. Brown 5 Ross Griffin 6 Guojing Chang 7 Dongjiang Yang 8 Jun Ren 9 Kevin Cooke 10 Peter T. Bishop 11 Wolfgang Theis 12 Richard Palmer 0000-0001-8728-8083 13 38237__17890__e7e95d36b2fb43f29f8cdcc0824825c2.pdf 38237.pdf 2020-08-11T11:58:00.8196081 Output 2842805 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution
spellingShingle Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution
Rongsheng Cai
Richard Palmer
title_short Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution
title_full Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution
title_fullStr Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution
title_full_unstemmed Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution
title_sort Performance of Preformed Au/Cu Nanoclusters Deposited on MgO Powders in the Catalytic Reduction of 4-Nitrophenol in Solution
author_id_str_mv c2d38332a07bde5ce1ce66d8750f652e
6ae369618efc7424d9774377536ea519
author_id_fullname_str_mv c2d38332a07bde5ce1ce66d8750f652e_***_Rongsheng Cai
6ae369618efc7424d9774377536ea519_***_Richard Palmer
author Rongsheng Cai
Richard Palmer
author2 Rongsheng Cai
Peter R. Ellis
Jinlong Yin
Jian Liu
Christopher M. Brown
Ross Griffin
Guojing Chang
Dongjiang Yang
Jun Ren
Kevin Cooke
Peter T. Bishop
Wolfgang Theis
Richard Palmer
format Journal article
container_title Small
container_volume 14
container_issue 13
container_start_page 1703734
publishDate 2018
institution Swansea University
issn 16136810
doi_str_mv 10.1002/smll.201703734
document_store_str 1
active_str 0
description The deposition of preformed nanocluster beams onto suitable supports represents a new paradigm for the precise preparation of heterogeneous catalysts. The performance of the new materials must be validated in model catalytic reactions. It is shown that gold/copper (Au/Cu) nanoalloy clusters (nanoparticles) of variable composition, created by sputtering and gas phase condensation before deposition onto magnesium oxide powders, are highly active for the catalytic reduction of 4-nitrophenol in solution at room temperature. Au/Cu bimetallic clusters offer decreased catalyst cost compared with pure Au and the prospect of beneficial synergistic effects. Energy-dispersive X-ray spectroscopy coupled with aberration-corrected scanning transmission electron microscopy imaging confirms that the Au/Cu bimetallic clusters have an alloy structure with Au and Cu atoms randomly located. Reaction rate analysis shows that catalysts with approximately equal amounts of Au and Cu are much more active than Au-rich or Cu-rich clusters. Thus, the interplay between the Au and Cu atoms at the cluster surface appears to enhance the catalytic activity substantially, consistent with model density functional theory calculations of molecular binding energies. Moreover, the physically deposited clusters with Au/Cu ratio close to 1 show a 25-fold higher activity than an Au/Cu reference sample made by chemical impregnation.
published_date 2018-03-27T03:48:21Z
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score 11.01353

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